Friction nanometer generator voltage stabilizing system based on quasi-Z-source switched capacitor network

Abstract

The invention discloses a friction nanometer generator voltage stabilizing system based on a quasi-Z-source switched capacitor network. The friction nanometer generator voltage stabilizing system comprises a single-phase uncontrolled rectifier bridge, the quasi-Z-source switched capacitor network, a voltage stabilizing control circuit and a driving circuit. The input end of the single-phase uncontrolled rectifier bridge is connected with the friction nanometer power generation device, so that the function of converting alternating current generated by the friction nanometer power generation device into direct current is realized; the output end of the single-phase uncontrolled rectifier bridge is connected with the input end of the quasi-Z-source switched capacitor network, and the function of increasing the output voltage of the single-phase uncontrolled rectifier bridge is achieved through the quasi-Z-source switched capacitor network. The input end of the voltage stabilization control circuit is connected to the voltage output end of the quasi-Z-source switched capacitor network, and the voltage stabilization control circuit generates a control signal by comparing a reference voltage with an output voltage of the quasi-Z-source switched capacitor network to control on and off of a power MOS tube device in the quasi-Z-source switched capacitor network, so that an automatic voltage stabilization control function is realized. According to the invention, a higher voltage step-up ratio is realized, and the size and cost of the device are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage stabilization of a triboelectric nanogenerator (TENG), and in particular to a triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network. Background Art

[0002] With the rapid development and application of IoT nodes, higher requirements are placed on the size, weight and efficiency of their energy management systems. Friction nanogenerators are a new type of energy harvesting device that converts mechanical energy into electrical energy using the contact electrification effect and electrostatic induction principle. They have the advantages of high output voltage, low cost, light weight and easy manufacturing. They are suitable for collecting low-frequency environmental mechanical energy, such as human motion, wind, water flow, etc., and can be used to power various IoT nodes. However, the output characteristics of friction nanogenerators are affected by many factors, such as material properties, structural design, working mode and external load conditions, resulting in unstable output voltage and current, which limits their use in applications that require a stable power supply.

[0003] In order to improve the energy conversion efficiency of the friction nanogenerator and solve the disadvantage of its unstable output, power electronic converters are usually used to rectify, boost or buck it. Traditional power electronic converters include DC-DC converters, AC-DC rectifiers, etc. These devices can effectively adjust the voltage level, but they are often large in size, high in cost and have limited efficiency.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the output voltage and current of the existing triboelectric nanogenerator voltage stabilization system are unstable, which limits its use in applications that require a stable power supply; in addition, a large transformer is required, which is often large in size, high in cost and limited in efficiency. The purpose of the present invention is to provide a triboelectric nanogenerator voltage stabilization system based on a quasi-Z source switched capacitor network, which achieves a higher voltage step-up ratio and does not require a large transformer, effectively reducing the size and cost of the device.

[0006] The present invention is achieved through the following technical solutions:

[0007] A friction nanogenerator voltage stabilization system based on a quasi-Z source switch capacitor network, the system comprising a single-phase uncontrolled rectifier bridge, a quasi-Z source switch capacitor network, a voltage stabilization control circuit and an optocoupler isolation drive circuit;

[0008] The input end of the single-phase uncontrolled rectifier bridge is connected to the friction nano-power generation device to realize the function of converting the alternating current generated by the friction nano-power generation device into direct current; the output end of the single-phase uncontrolled rectifier bridge is connected to the input end of the quasi-Z source switch capacitor network to realize the function of increasing the output voltage of the single-phase uncontrolled rectifier bridge through the quasi-Z source switch capacitor network;

[0009] The input end of the voltage stabilization control circuit is connected to the voltage output end of the quasi-Z-source switch capacitor network. The voltage stabilization control circuit generates a control signal by comparing a reference voltage with the output voltage of the quasi-Z-source switch capacitor network, and controls the switch of the power MOS tube device in the quasi-Z-source switch capacitor network through an optocoupler isolation drive circuit to realize an automatic voltage stabilization control function.

[0010] Further, the single-phase uncontrolled rectifier bridge includes a power diode VD1, a power diode VD2, a power diode VD3 and a power diode VD4;

[0011] The power diode VD1 and the power diode VD2 are connected in series to form a first branch, the power diode VD3 and the power diode VD4 are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to the quasi-Z source switch capacitor network;

[0012] The common end of the power diode VD1 and the power diode VD2 is used as the positive pole of the AC input end of the single-phase uncontrolled rectifier bridge, and the positive pole of the AC input end of the single-phase uncontrolled rectifier bridge is connected to the positive pole of the output end of the friction nano power generation device;

[0013] The common end of the power diode VD3 and the power diode VD4 is used as the negative pole of the AC input end of the single-phase uncontrolled rectifier bridge, and the negative pole of the AC input end of the single-phase uncontrolled rectifier bridge is connected to the negative pole of the output end of the friction nano power generation device.

[0014] Further, the quasi-Z source switched capacitor network includes an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor Co, a power diode D1, a power diode D2, a power diode D3, a power diode D4 and a power MOS tube S1;

[0015] One end of the inductor L1 is connected to the positive pole of the DC output end of the single-phase uncontrolled rectifier bridge, the other end of the inductor L1 is connected to the anode end of the power diode D1, the cathode end of the power diode D1 is connected to one end of the inductor L2, the other end of the inductor L2 is connected to the positive end of the capacitor C3, the negative end of the capacitor C3 is connected to the negative end of the capacitor C4, and the positive end of the capacitor C4 is connected to the anode end of the power diode D4;

[0016] The negative terminal of the capacitor C1 is connected to the common terminal of the inductor L1 and the power diode D1, and the positive terminal of the capacitor C1 is connected to the common terminal of the inductor L2 and the capacitor C3;

[0017] The negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is connected to the negative end of the capacitor C2, and the positive end of the capacitor C2 is connected to the common end of the power diode D1 and the inductor L2; the negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is also connected to the source of the power MOS tube S1, and the drain of the power MOS tube S1 is connected to the common end of the inductor L2 and the capacitor C3; the negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is also connected to one end of the inductor L3, and the other end of the inductor L3 is connected to the common end of the capacitor C3 and the capacitor C4; The negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the anode end of the power diode D3, and the cathode end of the power diode D3 is connected to the common end of the capacitor C4 and the power diode D4; the negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the anode end of the power diode D2, and the cathode end of the power diode D2 is connected to the common end of the capacitor C3 and the capacitor C4; the negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the negative end of the capacitor Co, the positive end of the capacitor Co and the cathode end of the power diode D4;

[0018] The cathode terminal of the power diode D4 serves as the output terminal of the quasi-Z source switched capacitor network.

[0019] Furthermore, the inductance values ​​of the inductor L1 and the inductor L2 are both L0, and the inductance value of the inductor L3 is 6 times L0.

[0020] Furthermore, the capacitance values ​​of the capacitor C3 and the capacitor C4 are both C0, and the capacitance values ​​of the capacitor C1 and the capacitor C2 are both 3 times of C0.

[0021] Furthermore, the power MOS tube S1 is a power N-channel MOS tube.

[0022] Furthermore, the DC input terminal of the voltage stabilization control circuit is connected to the positive terminal of the capacitor Co in the quasi-Z source switch capacitor network and the cathode terminal of the power diode D4 through a resistor voltage divider network.

[0023] Further, the resistor voltage divider network includes a resistor Ra and a resistor Rb;

[0024] The first end of the resistor Ra is connected to the positive terminal of the capacitor Co in the quasi-Z source switch capacitor network and the cathode terminal of the power diode D4, the second end of the resistor Ra is connected to the first end of the resistor Rb and the DC input terminal of the voltage stabilizing control circuit, the second end of the resistor Rb is connected to the negative electrode of the capacitor Co in the quasi-Z source switch capacitor network, and the second end of the resistor Rb is also grounded.

[0025] Furthermore, the voltage stabilization control circuit includes a non-polar capacitor Cc , resistor R1, resistor R2, operational amplifier A1, comparator COMP, periodic isosceles triangle wave signal generator S1 and reference voltage source P1;

[0026] The first end of the resistor R1 is connected to the second end of the resistor Ra in the resistor voltage divider network as the DC input end of the voltage stabilization control circuit, the second end of the resistor R1 is connected to the first end of the resistor R2 and the negative input of the operational amplifier A1, and the second end of the resistor R2 is connected to the non-polar capacitor C c The first end is connected, the second end of the non-polar capacitor Cc is connected to the output end of the operational amplifier A1 and the positive end of the comparator COMP, the output end of the periodic isosceles triangle wave signal generator S1 is connected to the negative end of the comparator COMP, the reference voltage source P1 is connected to the positive input of the operational amplifier A1, and the output end of the comparator COMP is connected to the gate of the power MOS tube in the quasi-Z source switch capacitor network to provide a switch control signal.

[0027] Furthermore, the non-polar capacitor C c Use ceramic capacitors.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] The present invention discloses a friction nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network. The friction nanogenerator voltage stabilization circuit based on a quasi-Z-source switched capacitor network of the present invention achieves a higher voltage step-up ratio and does not require a large transformer, thereby effectively reducing the size and cost of the device and contributing to the miniaturization and lightweight of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0031] Figure 1 This is a structural diagram of a friction nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network of the present invention;

[0032] Figure 2 A circuit diagram of a friction nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network of the present invention;

[0033] Figure 3 The single-phase uncontrolled rectifier bridge circuit diagram of the present invention;

[0034] Figure 4 The quasi-Z source switched capacitor network circuit diagram of the present invention;

[0035] Figure 5 is a voltage divider network circuit diagram of the present invention;

[0036] Figure 6 It is a voltage stabilizing control circuit diagram of the present invention;

[0037] Figure 7 It is a steady-state output voltage waveform diagram of the present invention;

[0038] Figure 8 It is a comparison diagram of the output voltage transformation ratio of the present invention and the existing solution. DETAILED DESCRIPTION

[0039] Hereinafter, the term "include" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present invention, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0040] In various embodiments of the present invention, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0041] The expressions (such as "first", "second", etc.) used in various embodiments of the present invention may modify the various constituent elements in various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing an element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0042] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0043] The terms used in various embodiments of the present invention are only used for the purpose of describing specific embodiments and are not intended to limit various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meaning generally understood by those of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in various embodiments of the present invention.

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0045] Considering that the quasi-Z-source converter is an emerging topology, it has gradually become an alternative to traditional converters because it can realize the buck-boost function without an additional transformer and reduce electromagnetic interference (EMI). The switched capacitor network is a technology that changes the circuit parameters by switching the state of the capacitor. It can be used to build various types of DC-DC converters. Compared with traditional magnetic components, the switched capacitor network has higher power density and better efficiency, and is easier to integrate into miniaturized systems. Combined with the characteristics of the quasi-Z-source converter, the switched capacitor network can provide a stable output voltage over a wider input range, which is especially important for energy sources such as TENG with large output fluctuations. In addition, in many applications, a stable DC output is required. Therefore, in addition to efficient energy conversion, a good voltage stabilization mechanism is also required to ensure the stability of the output voltage. The control circuit monitors the output voltage in real time and adjusts the switch state according to the set target voltage value to maintain the output voltage at a constant level. The design of the quasi-Z-source switched capacitor network meets this development and application trend because it not only helps to reduce the volume and weight of the entire system.

[0046] The present invention designs a friction nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network, and adopts power electronic conversion technology based on a quasi-Z-source switched capacitor network to realize a solution for collecting and stabilizing the electric energy of the friction nanogenerator. The quasi-Z-source switched capacitor network combines the advantages of both the Z-source converter and the switched capacitor network, and can adjust the output voltage within a certain range with a higher voltage transformation ratio without using a traditional transformer, which is conducive to the miniaturization and lightweight of the power supply device.

[0047] Example 1

[0048] like Figure 1 As shown, the present invention provides a friction nanogenerator voltage stabilization system based on a quasi-Z source switch capacitor network, the system comprising a single-phase uncontrolled rectifier bridge, a quasi-Z source switch capacitor network, a voltage stabilization control circuit and an optocoupler isolation drive circuit;

[0049] The input end of the single-phase uncontrolled rectifier bridge is connected to the friction nano-power generation device to realize the function of converting the alternating current generated by the friction nano-power generation device into direct current; the output end of the single-phase uncontrolled rectifier bridge is connected to the input end of the quasi-Z source switch capacitor network to realize the function of increasing the output voltage of the single-phase uncontrolled rectifier bridge through the quasi-Z source switch capacitor network;

[0050] The input end of the voltage stabilization control circuit is connected to the voltage output end of the quasi-Z-source switch capacitor network. The voltage stabilization control circuit generates a control signal by comparing a reference voltage with the output voltage of the quasi-Z-source switch capacitor network, and controls the switch of the power MOSFET device in the quasi-Z-source switch capacitor network through an optocoupler isolation drive circuit to realize an automatic voltage stabilization control function.

[0051] Figure 2 This is a circuit diagram of a friction nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network. Figure 1 and Figure 2 The friction nano power generation unit is the friction nano power generation device.

[0052] In this embodiment, Figure 3 As shown, the single-phase uncontrolled rectifier bridge includes a power diode VD1, a power diode VD2, a power diode VD3 and a power diode VD4;

[0053] The power diode VD1 and the power diode VD2 are connected in series to form a first branch, the power diode VD3 and the power diode VD4 are connected in series to form a second branch, the first branch and the second branch are connected in parallel to the quasi-Z source switch capacitor network; the anode end of the power diode VD2 and the anode end of the power diode VD4 are both connected to the negative end of the capacitor C2; the anode end of the power diode VD1 and the cathode end of the power diode VD3 are both connected to the inductor L1;

[0054] The common end of the power diode VD1 and the power diode VD2 is used as the positive pole of the AC input end of the single-phase uncontrolled rectifier bridge, and the positive pole of the AC input end of the single-phase uncontrolled rectifier bridge is connected to the positive pole of the output end of the friction nano power generation device;

[0055] The common end of the power diode VD3 and the power diode VD4 is used as the negative pole of the AC input end of the single-phase uncontrolled rectifier bridge, and the negative pole of the AC input end of the single-phase uncontrolled rectifier bridge is connected to the negative pole of the output end of the friction nano power generation device.

[0056] In this embodiment, Figure 4 As shown, the quasi-Z source switched capacitor network includes an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor Co, a power diode D1, a power diode D2, a power diode D3, a power diode D4 and a power MOS tube S1;

[0057] One end of the inductor L1 is connected to the positive pole of the DC output end of the single-phase uncontrolled rectifier bridge, the other end of the inductor L1 is connected to the anode end of the power diode D1, the cathode end of the power diode D1 is connected to one end of the inductor L2, the other end of the inductor L2 is connected to the positive end of the capacitor C3, the negative end of the capacitor C3 is connected to the negative end of the capacitor C4, and the positive end of the capacitor C4 is connected to the anode end of the power diode D4;

[0058] The negative terminal of the capacitor C1 is connected to the common terminal of the inductor L1 and the power diode D1, and the positive terminal of the capacitor C1 is connected to the common terminal of the inductor L2 and the capacitor C3;

[0059] The negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is connected to the negative end of the capacitor C2, and the positive end of the capacitor C2 is connected to the common end of the power diode D1 and the inductor L2; the negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is also connected to the source of the power MOS tube S1, and the drain of the power MOS tube S1 is connected to the common end of the inductor L2 and the capacitor C3; the negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is also connected to one end of the inductor L3, and the other end of the inductor L3 is connected to the common end of the capacitor C3 and the capacitor C4; The negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the anode end of the power diode D3, and the cathode end of the power diode D3 is connected to the common end of the capacitor C4 and the power diode D4; the negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the anode end of the power diode D2, and the cathode end of the power diode D2 is connected to the common end of the capacitor C3 and the capacitor C4; the negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the negative end of the capacitor Co, the positive end of the capacitor Co and the cathode end of the power diode D4;

[0060] The cathode terminal of the power diode D4 serves as the output terminal of the quasi-Z source switched capacitor network.

[0061] Among them, the inductance values ​​of the inductor L1 and the inductor L2 are both L0, and the inductance value of the inductor L3 is 6 times L0; the capacitance values ​​of the capacitor C3 and the capacitor C4 are both C0, and the capacitance values ​​of the capacitor C1 and the capacitor C2 are both 3 times C0; the power MOS tube S1 is a power N-channel MOS tube.

[0062] In this embodiment, the DC input terminal of the voltage stabilization control circuit is connected to the positive terminal of the capacitor Co in the quasi-Z source switch capacitor network and the cathode terminal of the power diode D4 through a resistor voltage divider network.

[0063] like Figure 5 As shown, the resistor voltage divider network includes a resistor Ra and a resistor Rb;

[0064] The first end of the resistor Ra is connected to the positive terminal of the capacitor Co in the quasi-Z source switch capacitor network and the cathode terminal of the power diode D4, the second end of the resistor Ra is connected to the first end of the resistor Rb and the DC input terminal of the voltage stabilizing control circuit, the second end of the resistor Rb is connected to the negative electrode of the capacitor Co in the quasi-Z source switch capacitor network, and the second end of the resistor Rb is also grounded.

[0065] In this embodiment, Figure 6 As shown, the voltage stabilization control circuit includes a non-polar capacitor C c , resistor R1, resistor R2, operational amplifier A1, comparator COMP, periodic isosceles triangle wave signal generator S1 and reference voltage source P1;

[0066] The first end of the resistor R1 is connected to the second end of the resistor Ra in the resistor voltage divider network as the DC input end of the voltage stabilization control circuit, the second end of the resistor R1 is connected to the first end of the resistor R2 and the negative input of the operational amplifier A1, and the second end of the resistor R2 is connected to the non-polar capacitor C c The first end is connected, the second end of the non-polar capacitor Cc is connected to the output end of the operational amplifier A1 and the positive end of the comparator COMP, the output end of the periodic isosceles triangle wave signal generator S1 is connected to the negative end of the comparator COMP, the reference voltage source P1 is connected to the positive input of the operational amplifier A1, and the output end of the comparator COMP is connected to the gate of the power MOS tube in the quasi-Z source switch capacitor network to provide a switch control signal.

[0067] In the specific implementation, when the friction nanogenerator generates 0-5.5V AC, the inductance values ​​of inductors L1 and L2 in the quasi-Z source switch capacitor network are both 500μH, the inductance value of inductor L3 is 3mH, the capacitance values ​​of capacitors C3, C4, and C5 are both 33μF, the capacitance values ​​of capacitors C1 and C2 are both 100μF, and the non-polar capacitor C c Using 10nF ceramic capacitors, resistors R1 and R2 are both 10kΩ metal film oxide resistors, periodic isosceles triangle wave signal generator S1 is a periodic isosceles triangle wave with a frequency of 50kHz and an amplitude of 1V, and the reference voltage source P1 is a 2.5V DC regulated power supply. The system steady-state output is as follows: Figure 7 shown.

[0068] from Figure 7 It can be seen that in steady state, the output voltage is stable at about 400V DC, indicating that the system proposed in the present invention can better convert the low-amplitude AC power generated by the friction nano power generation unit into stable DC power with a higher voltage transformation ratio.

[0069] In addition, the voltage transformation ratio of the quasi-Z source switched capacitor network in the present invention is compared with similar non-isolated solutions in other existing literature that do not use a transformer for voltage boosting, such as Figure 8 shown.

[0070] from Figure 8 It can be seen that the friction nano-power generation voltage stabilization circuit based on the quasi-Z-source switched capacitor network of the present invention achieves a higher voltage step-up ratio and does not require the introduction of a transformer. Since no windings and iron cores are required, it helps to reduce the volume and weight of the device.

[0071] in, Figure 8 Reference [1] is a quasi-Z-source isolated DC-DC boost converter, reference [2] is a cascaded Z-source DC-DC boost converter, and reference [3] is a Z-source DC-DC boost converter used in the field of photovoltaic power generation.

[0072] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network, characterized in that: The system includes a single-phase uncontrolled rectifier bridge, a quasi-Z source switch capacitor network, a voltage stabilization control circuit and an optocoupler isolation drive circuit; The input end of the single-phase uncontrolled rectifier bridge is connected to the friction nano-power generation device to realize the function of converting the alternating current generated by the friction nano-power generation device into direct current; the output end of the single-phase uncontrolled rectifier bridge is connected to the input end of the quasi-Z source switch capacitor network to realize the function of increasing the output voltage of the single-phase uncontrolled rectifier bridge through the quasi-Z source switch capacitor network; The input end of the voltage stabilization control circuit is connected to the voltage output end of the quasi-Z-source switch capacitor network. The voltage stabilization control circuit generates a control signal by comparing a reference voltage with the output voltage of the quasi-Z-source switch capacitor network, and controls the switch of the power MOS tube device in the quasi-Z-source switch capacitor network through an optocoupler isolation drive circuit to realize an automatic voltage stabilization control function.

2. According to claim 1, a triboelectric nanogenerator voltage stabilization system based on a quasi-Z source switched capacitor network is characterized in that: The single-phase uncontrolled rectifier bridge includes a power diode VD1, a power diode VD2, a power diode VD3 and a power diode VD4; The power diode VD1 and the power diode VD2 are connected in series to form a first branch, the power diode VD3 and the power diode VD4 are connected in series to form a second branch, and the first branch and the second branch are connected in parallel to the quasi-Z source switch capacitor network; The common end of the power diode VD1 and the power diode VD2 is used as the positive pole of the AC input end of the single-phase uncontrolled rectifier bridge, and the positive pole of the AC input end of the single-phase uncontrolled rectifier bridge is connected to the positive pole of the output end of the friction nano power generation device; The common end of the power diode VD3 and the power diode VD4 is used as the negative pole of the AC input end of the single-phase uncontrolled rectifier bridge, and the negative pole of the AC input end of the single-phase uncontrolled rectifier bridge is connected to the negative pole of the output end of the friction nano power generation device.

3. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z source switched capacitor network according to claim 1, characterized in that: The quasi-Z source switch capacitor network includes an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor Co, a power diode D1, a power diode D2, a power diode D3, a power diode D4 and a power MOS tube S1; One end of the inductor L1 is connected to the positive pole of the DC output end of the single-phase uncontrolled rectifier bridge, the other end of the inductor L1 is connected to the anode end of the power diode D1, the cathode end of the power diode D1 is connected to one end of the inductor L2, the other end of the inductor L2 is connected to the positive end of the capacitor C3, the negative end of the capacitor C3 is connected to the negative end of the capacitor C4, and the positive end of the capacitor C4 is connected to the anode end of the power diode D4; The negative terminal of the capacitor C1 is connected to the common terminal of the inductor L1 and the power diode D1, and the positive terminal of the capacitor C1 is connected to the common terminal of the inductor L2 and the capacitor C3; The negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is connected to the negative end of the capacitor C2, and the positive end of the capacitor C2 is connected to the common end of the power diode D1 and the inductor L2; the negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is also connected to the source of the power MOS tube S1, and the drain of the power MOS tube S1 is connected to the common end of the inductor L2 and the capacitor C3; the negative electrode of the DC output end of the single-phase uncontrolled rectifier bridge is also connected to one end of the inductor L3, and the other end of the inductor L3 is connected to the common end of the capacitor C3 and the capacitor C4; The negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the anode end of the power diode D3, and the cathode end of the power diode D3 is connected to the common end of the capacitor C4 and the power diode D4; the negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the anode end of the power diode D2, and the cathode end of the power diode D2 is connected to the common end of the capacitor C3 and the capacitor C4; the negative electrode of the DC output terminal of the single-phase uncontrolled rectifier bridge is also connected to the negative end of the capacitor Co, the positive end of the capacitor Co and the cathode end of the power diode D4; The cathode terminal of the power diode D4 serves as the output terminal of the quasi-Z source switched capacitor network.

4. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network according to claim 3, characterized in that: The inductance values ​​of the inductor L1 and the inductor L2 are both L0, and the inductance value of the inductor L3 is 6 times L0.

5. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network according to claim 3, characterized in that: The capacitance values ​​of the capacitor C3 and the capacitor C4 are both C0, and the capacitance values ​​of the capacitor C1 and the capacitor C2 are both 3 times of C0.

6. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network according to claim 3, characterized in that: The power MOS tube S1 is a power N-channel MOS tube.

7. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z source switched capacitor network according to claim 1, characterized in that: The DC input terminal of the voltage stabilization control circuit is connected to the positive terminal of the capacitor Co in the quasi-Z source switch capacitor network and the cathode terminal of the power diode D4 through a resistor voltage divider network.

8. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network according to claim 7, characterized in that: The resistor voltage divider network includes a resistor Ra and a resistor Rb; The first end of the resistor Ra is connected to the positive terminal of the capacitor Co in the quasi-Z source switch capacitor network and the cathode terminal of the power diode D4, the second end of the resistor Ra is connected to the first end of the resistor Rb and the DC input terminal of the voltage stabilizing control circuit, the second end of the resistor Rb is connected to the negative electrode of the capacitor Co in the quasi-Z source switch capacitor network, and the second end of the resistor Rb is also grounded.

9. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z-source switched capacitor network according to claim 1, characterized in that: The voltage stabilization control circuit includes a non-polar capacitor C c , resistor R1, resistor R2, operational amplifier A1, comparator COMP, periodic isosceles triangle wave signal generator S1 and reference voltage source P1; The first end of the resistor R1 is connected to the second end of the resistor Ra in the resistor voltage divider network as the DC input end of the voltage stabilization control circuit, the second end of the resistor R1 is connected to the first end of the resistor R2 and the negative input of the operational amplifier A1, and the second end of the resistor R2 is connected to the non-polar capacitor C c The first end is connected, the second end of the non-polar capacitor Cc is connected to the output end of the operational amplifier A1 and the positive end of the comparator COMP, the output end of the periodic isosceles triangle wave signal generator S1 is connected to the negative end of the comparator COMP, the reference voltage source P1 is connected to the positive input of the operational amplifier A1, and the output end of the comparator COMP is connected to the gate of the power MOS tube in the quasi-Z source switch capacitor network to provide a switch control signal.

10. The triboelectric nanogenerator voltage stabilization system based on a quasi-Z source switched capacitor network according to claim 9, characterized in that: The non-polar capacitor C c Use ceramic capacitors.

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